.app-header {
  background: #fff !important;
  padding: 0 16px !important;
  display: flex !important;
  align-items: center !important;
  justify-content: space-between !important;
  height: 48px !important;
  border-bottom: 1px solid #f0f0f0 !important;
  box-shadow: 0 1px 4px rgba(0, 21, 41, 0.08);
  z-index: 999;
}

.header-left {
  display: flex;
  align-items: center;
  flex: 1;
}

.menu-toggle {
  cursor: pointer;
  margin-right: 16px;
  font-size: 18px;
  color: #666;
  transition: color 0.2s;
  display: flex;
  align-items: center;
  justify-content: center;
  width: 32px;
  height: 32px;
  border-radius: 4px;
}

.menu-toggle:hover {
  color: #146bb5;
  background: #f5f5f5;
}

.breadcrumb {
  flex: 1;
}

.breadcrumb .ant-breadcrumb-link {
  color: #666;
  font-size: 14px;
}

.breadcrumb .ant-breadcrumb-separator {
  color: #d9d9d9;
  margin: 0 8px;
}

.user-avatar {
  cursor: pointer;
  margin-left: 24px;
  border: 2px solid #f0f0f0;
  transition: border-color 0.2s;
}

.user-avatar:hover {
  border-color: #146bb5;
}

/* 响应式设计 */
@media (max-width: 768px) {
  .app-header {
    padding: 0 12px !important;
    height: 40px !important;
  }
  
  .menu-toggle {
    margin-right: 12px;
    font-size: 16px;
  }
  
  .user-avatar {
    margin-left: 16px;
  }
}

